Hm...
Actually, I really like it. There are just two major problems; one, the characters need to be part of Squad 4, a Militia unit and two, we don't have any tanks. The Gallian Army is something like an antagonist for a lot of this RP and the lack of supplies given to Militia forces is gonna be a big plot point.
I really like what you've got there though, which makes things difficult... Might be willing to have them transfer to the squad after their tank is destroyed, pending a new one being issued or (more likely) and Imperial tank getting nicked.